Getting frustrated

Afternoon all.
Been with Plusnet for about 3 months now and from the start i've had a problem with loading web pages up, basically I have to click on a link at least 2-3 times, sometimes more, before a page will load up, although sometimes a page will load straight away. I would say the problem occurs about 80% of the time.
I have changed the DNS servers but this made no difference.
I'm just wandering if it has something to do with Plusnets traffic shaping.
Anything you guys can offer before I get onto Plusnet support?
Non LLU by the way.
Thanks
Jeff